On his last visit to the show, Grohl showed up dressed as David Letterman to fill in as host. This time, he discussed being asked to jam with Prince, playing every instrument in his upcoming 23-minute song and upcoming Foo Fighters shows.

“If Black Sabbath and ABBA had a love baby, it would be Nirvana” Grohl noted of his diverse and non-exclusive music tastes before giving Kimmel his head… literally.

Get the story behind the strange gift below:

“I’ve never had a guest give me his head before… this is very exciting!”